Re: [PATCH v5 22/23] KVM: arm64: GICv4.1: Allow non-trapping WFI when using HW SGIs
From: Zenghui Yu <yuzenghui@huawei.com>
Date: 2020-03-20 04:23:30
Also in:
kvm, kvmarm, lkml
Hi Marc, On 2020/3/5 4:33, Marc Zyngier wrote:
Just like for VLPIs, it is beneficial to avoid trapping on WFI when the vcpu is using the GICv4.1 SGIs. Add such a check to vcpu_clear_wfx_traps(). Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Zenghui Yu <yuzenghui@huawei.com> Thanks
quoted hunk ↗ jump to hunk
--- arch/arm64/include/asm/kvm_emulate.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h index f658dda12364..a30b4eec7cb4 100644 --- a/arch/arm64/include/asm/kvm_emulate.h +++ b/arch/arm64/include/asm/kvm_emulate.h@@ -89,7 +89,8 @@ static inline unsigned long *vcpu_hcr(struct kvm_vcpu *vcpu) static inline void vcpu_clear_wfx_traps(struct kvm_vcpu *vcpu) { vcpu->arch.hcr_el2 &= ~HCR_TWE; - if (atomic_read(&vcpu->arch.vgic_cpu.vgic_v3.its_vpe.vlpi_count)) + if (atomic_read(&vcpu->arch.vgic_cpu.vgic_v3.its_vpe.vlpi_count) || + vcpu->kvm->arch.vgic.nassgireq) vcpu->arch.hcr_el2 &= ~HCR_TWI; else vcpu->arch.hcr_el2 |= HCR_TWI;
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